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| Mirrors > Home > ILE Home > Th. List > enrefg | GIF version | ||
| Description: Equinumerosity is reflexive. Theorem 1 of [Suppes] p. 92. (Contributed by NM, 18-Jun-1998.) (Revised by Mario Carneiro, 26-Apr-2015.) |
| Ref | Expression |
|---|---|
| enrefg | ⊢ (𝐴 ∈ 𝑉 → 𝐴 ≈ 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | f1oi 5626 | . . 3 ⊢ ( I ↾ 𝐴):𝐴–1-1-onto→𝐴 | |
| 2 | f1oen2g 6933 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐴 ∈ 𝑉 ∧ ( I ↾ 𝐴):𝐴–1-1-onto→𝐴) → 𝐴 ≈ 𝐴) | |
| 3 | 1, 2 | mp3an3 1362 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐴 ∈ 𝑉) → 𝐴 ≈ 𝐴) |
| 4 | 3 | anidms 397 | 1 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ≈ 𝐴) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2201 class class class wbr 4089 I cid 4387 ↾ cres 4729 –1-1-onto→wf1o 5327 ≈ cen 6912 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2203 ax-14 2204 ax-ext 2212 ax-sep 4208 ax-pow 4266 ax-pr 4301 ax-un 4532 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-nf 1509 df-sb 1810 df-eu 2081 df-mo 2082 df-clab 2217 df-cleq 2223 df-clel 2226 df-nfc 2362 df-ral 2514 df-rex 2515 df-v 2803 df-un 3203 df-in 3205 df-ss 3212 df-pw 3655 df-sn 3676 df-pr 3677 df-op 3679 df-uni 3895 df-br 4090 df-opab 4152 df-id 4392 df-xp 4733 df-rel 4734 df-cnv 4735 df-co 4736 df-dm 4737 df-rn 4738 df-res 4739 df-ima 4740 df-fun 5330 df-fn 5331 df-f 5332 df-f1 5333 df-fo 5334 df-f1o 5335 df-en 6915 |
| This theorem is referenced by: enref 6943 eqeng 6944 domrefg 6945 mapdom1g 7038 fidifsnen 7062 nnfi 7064 onenon 7393 oncardval 7395 cardonle 7396 dju1en 7433 xpdjuen 7438 iseqf1olemqf1o 10774 hashun 11074 lgseisenlem2 15829 |
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